Code Examples from CMSC 202

This repository contains examples that we covered in class and may include additional tidbits that I think are worth sharing.

Clarifications from class

Clarifications from lecture will be listed below.

2017-02-13

Changing your shell (the quick and dirty way)

It turns out that bash does work as a hack version of changing your shell, I was just checking the wrong variable to show that it worked!

[jkukla1@linux1 cmsc202]$ echo $BASH
BASH: Undefined variable.
[jkukla1@linux1 cmsc202]$ bash
[linux1] cmsc202> echo $BASH
/bin/bash
[linux1] cmsc202>

I did find the answer for how to test this on stack overflow. ;)

Split-screen in emacs

• To split the emacs frame into two side-by-side windows, type C-x 3 (that's hold-down-control-and-x,-then-let-go-and-hit-3)
• Use C-x o to bounce back and forth
• To start a unix shell inside one of them type M-x ansi-term (that's tap-escape-and-let-go,-then-hit-x-then-type-ansi-term) ** Inside the ansi-term window you have a full blown shell and you can compile and test your program without ever leaving emacs.
• To change back to just one window, use C-x o to get to the window you want, then hit C-x 1
• To make the split top and bottom, use C-x 2
• To learn what emacs function a command executes, you can run M-x describe-key, then hit the key. For example, C-x 1 is: C-x 1 runs the command delete-other-windows, which is an interactive compiled Lisp function in `window.el'.

Useful links

• http://explainshell.com/ - A site where you can paste in a unix command and see what all the arguments do.